The main aim of this article is to provide a partial overview of the current research in developmental psychology and the research into emerging adulthood in particular. It is considered essential to look at this area of psychological research as there is little understanding about this life period in Slovakia. Interest in this issue is growing only slowly, as evidenced by the current interdisciplinary project (APVV-18-0303, Nozdrovická, 2019) and several studies on this topic from the perspective of other disciplines (Džambazovič, 2018; Roupa, 2016). The lack of research on emerging adulthood persists in Slovakia despite Arnett (2000) having already brought this concept to light in developmental psychology. Arnett (2000, 2004) explains that the dominant life course theory is no longer applicable due to significant demographic shifts, including the delay of marriage and parenthood. In order to measure proposed features of emerging adulthood as well as one additional dimension called “other-focus”, the Inventory of the Dimensions of Emerging Adulthood (IDEA) has been designed (Reifman, Arnett, & Colwell, 2007). There are more than ten language versions of the IDEA. In this article, a summary will be provided of all adaptations of the IDEA, some of which have been well-validated with conducted factor analysis. The use of this inventory enables a better understanding of experiencing emerging adulthood. It also allows perceptions of emerging adults to be contrasted between various countries and cultures.